[v4 0/4] arm64: kvm: reset hyp context for kexec

AKASHI Takahiro
2015-05-08T01:18:35Z

This patch set addresses KVM issue described in Geoff's kexec patch set[1].
See "Changes" below.
Initially, I used reboot notifier hook to shut down cpu cores, but in this
version, kvm cpu hotplug is implemented after Mark's comment.

I confirmed that it works with kexec under the following scenarios:
- boot 1st kernel
- run a guest OS
- (stop a guest OS)
- reboot 2nd kernel by kexec
- run a guest OS

test target: MediaTek MT8173-EVB
version: kernel v4.0-rc1 + Geoff's kexec v8 + Arn's patch[2]

But I didn't test other complicated scenarios with cpu hotplug.

On arm, Frediano[3] is no longer working on this issue as he left his
company. patch#4 is just a stub for arm.

Changes from v3:
* modified to use kvm cpu hotplug framework directly instead of reboot
notifier hook

Changes from v2:
* modified kvm_virt_to_trampoline() macro to fix a page-alignment issue[4]

Changes from v1:
* modified kvm_cpu_reset() implementation:
- define a macro to translate va to addr in trampoline
- use __hyp_default_vectors instead of kvm_get_hyp_stub_vectors()
- shuffle the arguments in __cpu_reset_hyp_mode()
- optimize TLB flush operations
* changed a patch#2's name
* added a patch#5 to add stub code for arm

[1] http://lists.infradead.org/pipermail/kexec/2015-April/335533.html
[2] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/334002.html
[3] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-February/322231.html
[4] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/334910.html

AKASHI Takahiro (4):
arm64: kvm: add a cpu tear-down function
arm64: kvm: add kvm cpu hotplug
arm64: kvm: remove !KEXEC dependency
arm: kvm: add stub implementation for kvm_cpu_reset()

arch/arm/include/asm/kvm_asm.h | 1 +
arch/arm/include/asm/kvm_host.h | 13 ++++++++++-
arch/arm/include/asm/kvm_mmu.h | 5 +++++
arch/arm/kvm/arm.c | 44 ++++++++++++++++++++++++++++---------
arch/arm/kvm/init.S | 6 +++++
arch/arm/kvm/mmu.c | 5 +++++
arch/arm64/include/asm/kvm_asm.h | 1 +
arch/arm64/include/asm/kvm_host.h | 12 +++++++++-
arch/arm64/include/asm/kvm_mmu.h | 7 ++++++
arch/arm64/include/asm/virt.h | 11 ++++++++++
arch/arm64/kvm/Kconfig | 1 -
arch/arm64/kvm/hyp-init.S | 32 +++++++++++++++++++++++++++
arch/arm64/kvm/hyp.S | 16 +++++++++++---
13 files changed, 138 insertions(+), 16 deletions(-)

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1.7.9.5